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I render a partial in one view:
<%= render 'video', :video => @video, :video_id => 'video_show_id' %>
and have this code in the partial:
<% if video_id %>
<%= link_to "video", video.video_url, :class => "oembed", :id => video_id %>
<% else %>
<%= link_to "video", video.video_url, :class => "oembed" %>
<% end %>
The problem is that this partial gets rendered in a number of places in my app, and in those other views I do not want to pass :video_id into the partial. Therefore my app throws an error that video_id is undefined. I could pass :video_id => "" into the partial in the other views, but since the partial is rendered in many places, that is kind of a pain. Is there a simpler way to handle this?
700
A variable that has not been assigned a value is of type undefined . A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .
TypeScript has a powerful system to deal with null or undefined values. By default null and undefined handling is disabled, and can be enabled by setting strictNullChecks to true.
Answer. You'd get an error trying to access the cat object's color property because cat itself was never defined.
Try defined? and not that it really matters but it's actually an operator.
<% if defined? video_id %>
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